Automated product emails are great for keeping your subscribers engaged with emails containing products relevant to them. However for most stores – your subscribers won't want product after product in their inbox every day. Follow these frequency guidelines when sending auto-product emails.

Average Purchase Frequency =
Total Orders (365 days) / Number of Unique Customers (365 days)

Average Time Between Purchases =
365 days / Average Purchase Frequency

Remember to mix up your emails with regular email newsletters featuring content, new products, and sales.